Consolidated Statements of Operations - MidAmerican Funding - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Operating revenue:
Total operating revenue	$ 5,283	$ 5,092	$ 14,003	$ 13,254
Operating costs and expenses:
Total operating costs and expenses	3,659	3,507	10,359	9,862
Operating income	1,624	1,585	3,644	3,392
Other income (expense):
Other Interest and Dividend Income	(464)	(460)	(1,379)	(1,401)
Allowance for borrowed funds	14	14	34	128
Allowance for equity funds	24	17	59	147
Other, net	2	15	24	26
Total other income (expense)	(392)	(375)	(1,177)	(1,007)
Income before income tax expense and equity income	1,232	1,210	2,467	2,385
Income tax expense	184	199	319	394
Net Income (Loss) Attributable to Parent	1,068	1,036	2,198	2,062
MidAmerican Funding, LLC and Subsidiaries [Domain]
Operating revenue:
Electric Domestic Regulated Revenue	707	692	1,677	1,572
Gas Domestic Regulated Revenue And Other Revenue	108	105	493	436
Total operating revenue	815	797	2,170	2,008
Operating costs and expenses:
Cost of Domestic Regulated Electric	130	130	342	312
Cost of Natural Gas Purchases And Cost of Other Goods And Services Sold	54	56	289	239
Utilities Operating Expense, Maintenance and Operations	202	181	549	511
Utilities Operating Expense, Depreciation and Amortization	111	118	369	338
Utilities Operating Expense, Taxes	30	28	90	84
Total operating costs and expenses	527	513	1,639	1,484
Operating income	288	284	531	524
Other income (expense):
Other Interest and Dividend Income	(59)	(55)	(177)	(164)
Allowance for borrowed funds	4	3	9	6
Allowance for equity funds	11	6	25	14
Other, net	6	3	14	9
Total other income (expense)	(38)	(43)	(129)	(135)
Income before income tax expense and equity income	250	241	402	389
Income tax expense	(133)	(77)	(214)	(129)
Net Income (Loss) Attributable to Parent	$ 383	$ 318	$ 616	$ 518